Doomday before 2012?

Most scholars consider that Mayan calendar began on Aug. 13, 3114 BC. But someone has come up with an earlier date of December 25, 3117 BC, the same as the Pharaonic Egyptian calendar.

I'm not a fan of theories that take many pages of math to explain, but the short story is:

Maya scholars have failed to adjust the continuous count of solar days of the Maya Long Count to a "longer" count including intercalation for the tropical year. When this adjustment is made, the Maya and Pharaonic calendars both start on December 25, 3117 BC (-3116 by astronomy).

Maya scholars start the Maya calendar on a Maya date called 4 Ahau 8 Cumku.
Both of these calendric glyphs (Ahau and Cumku) fall at the "end" of the Maya series of days and months in the Maya system, i.e. at the beginning of new eras, and we thus expect a Solstice or Equinox at this point in Maya calendration.

This would, I presume, bring forward the doomsday to roughly April 2010 (I think).